HITACHI VIEWCAM chassis (mechanizm) Service manual & schematics

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Page 1

SERVICE MANUAL

No. 6704E

PCF-9 MECHANISM

Disassembly & Adjustment

VHS

This video deck is a VHS type video recorder. For proper operation, only the VHS type cassette must be used.

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

VIDEO CAMERA/RECORDER

February 1997 Image & Information Media Systems Division, Tokai

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CHAPTER 1 DISASSEMBLY

1. REMO	OVAL PROCEDURE	E1-1
2. MAIN	N MECHANICAL COMPONENTS
IDEI	NTIFICATION	E1-3
2-1.	Top View	E1-3
2-2.	Bottom View	E1-3
3. MAIN	N MECHANICAL COMPONENTS REMOVAL	E1-4
3-1.	Cassette Holder and TSS (Supply
	Sensor) Circuit Board	E1-4
3-2.	Cylinder (Video Heads)	E1-5
3-3.	Audio/Control (A/C) Head	E1-5
3-4.	Full Erase (FE) Head	E1-6
3-5.	ESS (Supply End Sensor) Circuit Board	DI U
00.	and Loading Motor	E1-6
3-6.	ERS (Take-up Sensor) Circuit Board	LI U
0 00	(Take-up Reel Sensor/Take-up End
	Sensor/Cassette Holder Switch)	E1-7
3-7.	Capstan Motor	E1-7
3-8.	Pressure Roller Assembly	E1-8
3-9.	Tension Arm and Tension Band	E1-8
3-10.	Supply Reel Disk	E1-8
3-11.	Take-up Reel Disk	E1-9
3-12.	Take-up Sub Brake	E1-9
3-13.	Supply Guide Roller	E1-9
3-14.	Take-up Guide Roller	E1-10
3-15.	A/C Head Base	E1-10
3-16.	Take-up Guide Pole	E1-10
3-17.	Supply Guide Roller Base, Take-up
	Guide Roller Base, Guide Roller
	Rail and End LED	E1-11
3-18.	Supply Sub Brake	E1-11
3-19.	Cylinder Base	E1-12
3-20.	Supply Loading Cam Gear and
	Take-up Loading Cam Gear	E1-12
3-21.	Take-up Guide Arm	E1-12
3-22.	Pressure Roller Control Arm	E1-13
3-23.	Cassette Holder Lock Slider	E1-13
3-24.	Reel Gear Block, Mechanism State
	Switch and Relay Gear	E1-14
3-25.	Loading Gear	E1-15
3-26.	Tension Pole Drive Arm	E1-15
3-27.	Driving Gear	E1-16
3-28.	Cassette Holder Lock	E1-16
3-29.	Cam Gear Arm	E1-17
3-30.	Cassette Holder Lock Drive Arm	E1-17

CHAPTER 2 MECHANICAL ADJUSTMENT

JIGS AND TAPES FOR ADJUSTMENT	E2-1
1. TAPE TRANSPORT SYSTEM COMPONENTS
CHECK/ADJUSTMENT	E2-1
1-1. Reel Disk Height Adjustment	E2-1
1-2. Tension Pole Position/Tension
Adjustment	E2-2
1-3. Take-up Guide Poles height
Adjustment	E2-2
1-4. Supply/Take-up Guide Rollers Height
Adjustment	E2-3
1-5. A/C Head Adjustment	E2-4
2. ADJUSTMENT AFTER REPLACING THE
CYLINDER (VIDEO HEADS)	E2-5
3 TENSION AND TOROUT CHECKS	F2-5

CHAPTER 3 MAINTENANCE/INSPECTION PROCEDURE

1.	Required Maintenance	E3-1
2.	Scheduled Maintenance	E3-1
3.	Check Before Starting Repairs	E3-1
4.	Tool Needed for Inspection and
	Maintenance	E3-1
5.	Maintenance Procedures	E3-1
5-	-1. Cleaning	E3-1
5-	-2. Lubrication	E3-2
5-	-3. Greasing	E3-2

CHAPTER 4 EXPLODED VIEWS

1.	CHASSIS	(TOP VIEW) SECTION	4-1
2.	CHASSIS	(BOTTOM VIEW) SECTION	4-2

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CHAPTER 1

DISASSEMBLY

1. REMOVAL PROCEDURE

Before removing specific parts, see the table below to check the removal procedure. Remove the parts in the left column before removing the part in the right column. Remove the parts from the the top to the bottom of the left column in order. The parts not shown in the right column can be removed independently.

Example: Parts to remove in advance before removing the tension arm in item 3-9.

		3-9
		Tension Arm
3-1	Cassette Holder	1
3-1	Supply Sensor Circuit Board	2

ITE N No	ITEM No. REMOVE PARTS ORDER FOR REMOVING PARTS	3-8 Pressurė Roller Assembly	3-9 Tension Arm	3-9 Tension Band	3-10 Supply Reel Disk	3-11 Take-up Reel Disk	3-12 Take-up Sub Brake	3-15 A/C Head Base
3-1	Cassette Holder	1	1	1	1	1	1
3-1	Supply Sensor						@
	Circuit Board	(4)	Ŵ
3-3	A/C Head							_
3-9	Tension Arm				3
3-9	Tension Band					\|	\|

$\displaystyle$	ITEM No.	3-17	3-17	3-17	3-17	3-18	3-19	3-20	3-20
	REMOVE	Supply	Take-up	Guide	End	Supply	Cylinder	Supply	Take-up
1754	PARIS	Guide	Guide	Roller	LED	Sub	Base	Loading	Loading
No.	RENOVING PARTS	Roller	Roller	кан		Brake		Cam Gear	Cam gear
3-1	Cassette Holder			(I)		0	0	0	0
3-1	Supply Sensor	×			~
	Circuit Board	2)	2	2)	2	2	2	2	2
3-2	Cylinder	3	3	3		3	3	-	3
3-3	A/C Head	4	4
3-4	FE Head	5	5	5	5	5	5	5	5
3-9	Tension Arm	6	6	6	6	6	6	ē	6
3-9	Tension Band	7	1	7	7	1	1	1	Ō
3-13	Supply Guide
	Roller	Ű				e e			0
3-14	Take-up Guide							@
	Roller			3		9	9	9	(9)
3-15	A/C Head Base		10	0		0	10	10	0
3-17	Supply Guide			[	[
	Roller Base					U)	U.		U)
3-17	Take-up Guide		\|	\|		10	10
	Roller Base
3-17	Guide Roller	_				13	12	(10)	13
	Rail					6	6	(13)
3-17	End LED					14		14	4
3-19	Cylinder Base		\|					15	15

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I TEM No	ITEM No. REMOVE PARTS ORDER FOR REMOVING PARTS	3-21 Take-up Guide Arm	3-22 Pressure Roller Control Arm	3-23 Cassette Holder Lock Slider	3-24 Relay Gear	3-25 Loading Gear	3-26 Tension Pole Drive Arm
3-1	Cassette Holder	1	1	1
3-1	Supply Sensor	2	2	2
	Circuit Board			-
3-6	Take-up Sensor						(Î)
	Circuit Board				Û	Ū
3-8	Pressure Roller	(2)
	Assembly	9	3
3-24	Reel Gear Block					2	2

	ITEM No.	3-27	3-28	3-29	3-30
	REMOVE	Driving	Cassette	Cam Gear	Cassette
	PARIS	Gear	Holder	Arm	Holder
ITEM No	ORDER FOR		LOCK		Lock Drive Arm
3-6	Take-up Sensor
	Circuit Board	(I)	Û
3-7	Capstan Motor			2	2
3-24	Reel Gear Block	2	2	3	3
3-25	Loading Gear	3		4	4
3-26	Tension Pole
	Drive Arm	(4)		6	(5)
3-27	Driving Gear			6	6
3-29	Cam Gear Arm				1

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2. MAIN MECHANICAL COMPONENTS IDENTIFICATION

2-1. Top View

1. Cylinder (Video Head) 2. Guide Roller Rail X-Value Adjust Nut Take-up Guide Roller Audio/Control (A/C) Head 6. Take-up Guide Pole 7. Pressure Roller Assembly 8. Take-up Guide Arm 9. EST (Take-up End Sensor) Circuit Board 10. EL (End LED) Circuit Board 11. Take-up Reel Disk 12. Cassette holder Lock Slider 13. Reel Gear Block 14. Supply Reel Disk 14. Supply Keel Disk 15. Tension Band 16. Tension Arm 17. Supply Guide Roller 18. ESS (Supply End Sensor) Circuit Board 19. Supply Guide Post 20. Supply Guide Pole 21. Full Erase (FE) Head

Fig. 2-1

2-2. Bottom View

22. Cylinder Cover

Cylinder (Video Head) Supply Loading Cam Gear Loading Motor
4. Tension Pole Drive Arm
Mechanism State Switch TSS (Supply Sensor) Circuit Board
6. TSS (Suppry 7. Loading Gear
8. Driving Gear
9. ERS (Take-up Sensor) Circuit Board
10. Capstan Motor 11. Take-up Loading Cam Gear

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3. MAIN MECHANICAL COMPONENTS REMOVAL

Note: For the item marked *, refer to the Removal Procedure in item 1.

3-1. Cassette Holder and TSS (Supply Sensor) Circuit Board
Remove 1 screw (1) holding the TSS circuit board. (See Fig. 3-1) Release 1 tab (2) and lift up the cassette
holder. (See Fig. 3-2)
a) Remove the TSS circuit board in the direction of the arrow. (See Fig. 3-1)
4) Remove 2 screws (3) holding the cassette 4) Remove 2 screws (5) holding the cassette holder and cassette holder spring. (See Fig. 3-3) 5) Remove 1 screw (4) holding the cassette
holder and chassis holder. (See Fig. 3-4)
6) Move the front arm of the cassette holder in the direction of arrow (A). (See Figs. 3-3, 3-4) 7) Move the rear arm of the cassette holder in
the direction of arrow (B). (See Figs. 3-3, 3-4)

Fig. 3-2

Fig. 3-1

Fig. 3-3

Fig. 3-4

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3-2, Cylinder (Video Heads)
Remove 1 screw (1) holding the cylinder cover. (See Fig. 3-5) Remove 3 screws (2) holding the cylinder and
pull out the cylinder from the chassis. (See Fig. 3-6)
Cautions : 1. Do not touch the video head tips with your
Do not touch the video head tips with your fingers or tools. After reinstalling the cylinder, be sure to perform adjustment after replacing the cylinder.

Fig. 3-6

3-3. Audio/Control (A/C) Head

Disconnect the connector (1). (See Fig. 3-7) Remove 2 screws (2).
Caution :
l. Adjust as follows after installing the Audio/ Control Head. A/C HEAD ADJUSTMENT

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3-4. Full Erase (FE) Head

1) Disconnect the connector (1). (See Fig. 3-8)
2) Remove 1 screws (2).

3-5. ESS (Supply End Sensor) Circuit Board and Loading Motor
1) Remove 1 screw (1) holding the ESS circuit Remove 1 screw (1) holding the ESS circuit board. Release 1 tab (2) of the ESS circuit board. Remove the ESS circuit board. Remove 1 screw (3) holding the motor holder. Release 1 tab (4) of the motor holder. Remove the motor holder. Remove the motor holder. Release 3 tabs (5) holding the loding motor.

Fig. 3-9

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3-6. ERS (Take-up Sensor) Circuit Board (Take-up Reel Sensor/Take-up End Sensor/Cassette Holder Switch)
Remove 2 screw (1). (See Fig. 3-10) Release 3 tabs (2) and open the ERS circuit hoard.

3-7. Capstan Motor
1) Move the take-up guide arm in the direction of the arrow (pressure roller side). (See Fig. 3-11) 2) Remove 3 screws (1). 3) Disconnect the connector (2). (See Fig. 3-12) 4) Remove the capstan belt from the capstan motor. 6) Remove the capstan motor.

Fig. 3-11

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*3-8. Pressure Roller Assembly

1) Remove 2 screws (1), (See Fig. 3-13)
2) Pull out the pressure roller assembly.

1) Remove 1 tab (1) holding the tension arm (See Fig. 3-14) Release the tension spring. Remove 1 screw (2) holding the tension band.
4) Move the supply sub brake in the direction of
the arrow.
5) Remove the tension arm and tension band.6) Release 1 tab (3) and remove the tension band from the tension arm.

1) Remove 1 washer (1). (See Fig. 3-15)
2) Move the supply sub brake in the direction of the arrow.
3) Pull out the supply reel disk.

Cautions :

Take care not to lose the washer at the bottom of the reel disk.
reel disk.

Fig. 3-14

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*3-11. Take-up Reel Disk

Remove 1 washer (1). (See Fig. 3-16) Pull out the take-up reel disk.
Cautions :
1. Take case not to lose the washer at the bottom of the reel disk. 2. Adjust as follows after installing the take-up
reel disk. • REEL DISK HEIGHT ADJUSTMENT

Fig. 3-16

*3-12. Take-up Sub Brake

1) Remove the spring between the chassis and 1) Remove the spring between the chassis and take-up sub brake. (See Fig. 3-17) 2) Release 1 tab (1) and pull out the take-up
sub brake.

Fig. 3-17

3-13. Supply Guide Roller

1) Loosen 1 hexagonal screw (1) holding the
supply guide roller. (See Fig. 3-18) 2) Turn the upper section of the supply guide roller using a flat-head driver to remove the supply guide roller from the supply guide roller base.
Caution .
1. Adjust as follows after installing the supply guide roller. • SUPPLY/TAKE-UP GUIDE ROLLER HEIGHT ADJUSTMENT

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3-14. Take-up Guide Roller

1) Loosen 1 hexagonal screw (1) holding the
1) housen i hexagonal screw (1) housing the take-up guide roller. (See Fig. 3-19) 2) Turn the upper section of the take-up guide roller using a flat-head driver to remove the take-up guide roller from the take-up guide roller base
Caution :
1. Adjust as follows after installing the take-up guide roller. • SUPPLY/TAKE-UP GUIDE ROLLER HEIGHT ADJUSTMENT

Fig. 3-19

*3-15. A/C Head Base
Remove 1 nut (1). (See Fig. 3-20) Pull out the A/C head base together with the spring.

Fia. 3-20

3-16. Take-up Guide Pole

1) Turn the nut (5.0mm) at the top of the take-up guide pole and remove the take-up guide pole. (See Fig. 3-21)
Caution :
1. Adjust as follows after installing the take-up guide pole. • TAKE-UP GUIDE POLE HEIGHT ADJUSTMENT

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*3-17. Supply Guide Roller Base, Take-up Guide Roller Base, Guide Roller Rail and End LED
Remove 3 screws (1) holding the guide roller rail. (See Fig. 3-22) Release 7 tabs (2) and remove the guide
roller rail together with the supply guide roller base, take-up guide roller base and end LED.
3) Remove the end LED in the direction of the arrow from the guide roller rail.

Fig. 3-22

*3-18. Supply Sub Brake

Release the spring between the supply sub brake and chassis. (See Fig. 3-23) Pull out the supply sub brake.

Fig. 3-23

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1) Remove 3 screws (1). (See Fig. 3-24)

*3-20. Supply Loading Cam Gear and Take-up Loading Cam Gear
1) Remove the supply loading cam gear and take-up loading cam gear. (See Fig. 3-25)

Caution when reinstalling

Caution when reinstalling Align mark (A) on the supply loading cam gear and mark (B) on the take-up loading cam gear when reinstalling them. Check that the supply and take-up guide roller bases are in the unloading (stop) state (as shown in Fig. 3-26).

Fig. 3-25

*3-21. Take-up Guide Arm
Release the spring between the take-up guide arm and chassis. (See Fig. 3-27) Pull out the take-up guide arm.

Fig. 3-24

Fig. 3-26

Fig. 3-27

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*3-22. Pressure Roller Control Arm

Release the spring betweeen the pressure roller control arm and chassis. (See Fig. 3-28) Remove 1 washer (1) holding the pressure
roller control arm.
Pull out the pressure roller control arm from the chassis.

Fig. 3-28

*3-23. Cassette Holder Lock Slider

1) Remove 1 washer (1) and release 1 tab (2). (See Fig. 3-29)

Fig. 3-29

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*3-24. Reel Gear Block, Mechanism State Switch and Relay Gear
1) Remove the capstan belt from the reel gear block. (See Fig. 3-30)
2) Disconnect 1 connector (1) on the mechanism state switch
3) Remove 1 screw (2) holding the mechanism state switch.
4) Remove the mechanism state switch.
4) Remove the mechanism state switch. 5) Remove the relay gear. 6) Remove 4 screws (3) holding the reel gear block.
7) Remove the reel gear block.

•Caution when reinstalling

1) Reinstall the loading gear so its mark (c) and mark (D) on the supply loading cam gear are aligned. (See Fig. 3-32)
2) Reinstall the tension pole drive arm so that hole (E) in this arm is aligned with hole (F) in the driving gear. 3) Align section (A) of the mechanism state
switch and mark (B) of the rotor. (See Fig. 3-31)
4) Align hole (G) in the driving gear and mark (H) on the relay gear. Check that hole (I) in the relay gear in aligned with the hole in reel gear block. (See Fig. 3-32)
5) Install the mechanism state switch in condition set in step 3) in to the chassis.

(BOTTOM VIEW) Fig. 3-31

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*3-25. Loading Gear

1) Pull out the loading gear. (See Fig. 3-33)

Caution when reinstalling 1) Refer to the Fig. 3-32

Fig. 3-33

*3-26. Tension Pole Drive Arm

Pull out the tension pole drive arm. (See Fig. 3-34)

Caution when reinstalling 1) Refer to the Fig. 3-32

Fig. 3-34

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*3-27. Driving Gear

1) Pull out the driving gear. (See Fig. 3-35)
Caution when reinstalling
1) Move the cassette holder lock drive arm so that the pin comes into contact with section (A) of the cam gear arm. (See Fig. 3-36) 2) Reinstall the driving gear so that hole (B)
in the driving gear is aligned with the through-hole in the chassis. (See Fig. 3-37)

Fig. 3-35

Fig. 3-37

Fig. 3-36
*3-28. Cassette Holder Lock
Remove 1 screw (1). (See Fig. 3-38) Release 1 tab (2) and remove the cassette holder lock.

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*3-29. Cam Gear Arm

Move the cam gear arm in the direction of the arrow. (See Fig. 3-39) Pull out the cam gear arm from the chassis.

Fig. 3-39

*3-30. Cassette Holder Lock Drive Arm

Release the spring between the cassette holder lock drive arm and chassis. (See Fig. 3-40) Pull out the cassette holder lock drive arm.

Fig. 3-40

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CHAPTER 2

MECHANICAL ADJUSTMENT

JIGS AND TAPES FOR ADJUSTMENT

1. TAPE TRANSPORT SYSTEM COMPONENTS CHECK/ ADJUSTMENT

The tape transport system is the path from the supply reel disk to the take-up reel disk via the video heads. The tape treansport components, especially the components which come into direct contact with the tape, should be kept clean without damage, dust and oil, etc. adhering to the contact surfaces. The tape transport system is adjusted before shipment from the factory, so when any transport compoents are replaced, the transport system is stabilized by correctly adjusting the new components.

1-1. Reel Disk Height Adjustment (Fig. 1-1)

1) Place the master plane on the cassette holder and lower the holder.
2) Place a reel disk height jig on the master plane and fit it to the reel disk. 3) Check that the top of the reel disk is
3) Check that the top of the reel disk is positioned between sections A and B of the reel disk height jig.4) When the top of the reel disk is not
4) When the top of the reel disk is not positioned between section A and B, adjust the number of the spacers (2 types: 0.25mm and 0.5mm thick) at the bottom of the reel disk.

Fig. 1-1

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1-2. Tension Pole Position/Tension Adjustment (Fig. 1-2)

Tension Pole Position Adjustment

1) Hook the tension spring to notch (C) of the spring holder.
Block the supply end sensor with something which does not transmit light (thick paper, etc.)
3) Press the playback button without loading a cassette to set the unit to the loading state.
4) After loading is completed, loosen screw (B) holding the tension band holder and adjust the position of the tension band holder so the tension pole is above section (A) (concave) of the guide roller rail.
5) After adjustment is completed, tighten screw (B).

Tension Adjustment

Load the back tension meter and set to the playback mode.
2) Read the scale on the supply.
3) This reading should be between 19 and 26.
4) Move the tension arm spring to the position "A" or "B" on the spring holder when the tension adjustment tape reads 27 or higher, and to the position "D" or "E" on the spring holder when it is 18 or lower, and adjust the back tension for a nominal reading of 19-26 on the scale.
5) Recheck the tension arm position when the back tension is changed greatly (5 or more).
Note: The instrument must be in a horizontal position for this adjustment.

Fig. 1-2

1-3. Take-up Guide Poles Height Adjustment (Fig. 1-3)

1) Place the master plane on the cassette holder and lower the holder.
Place a reel disk height jig on the master plane and fit it to the guide pole.
3) Adjust the nut on the top of the guide pole so that the upper flange is aligned with the top edge of the height jig.

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1-4. Supply/Take-up Guide Rollers Height Adjustments (Figs. 1-4, 1-5)
1) Place the master plane on the cassette holder and lower the holder. Place the reel disk height jig on the master
plane and fit it to the guide roller. 3) Loosen the guide roller fixing hexagonal screw and use a flat-bladed screwdriver. etc. to turn the top of the guide roller to adjust so the upper flange of the guide roller is aligned with the top surface of the reel disk 4) After adjustment is completed, tighten the
4) After adjustment is completed, tighten the guide roller fixing hexagonal screw.5) Run a blank tape and check that the tape does
not curl or ride over the guide roller. If it curls or rides over the guide roller, fine adjust the height of the guide rollers.
6) Connect an oscilloscope to test point of the FM envelope.
Trigger the oscilloscope at SW30Hz.
8) Playback the color bar signal on alignment tape and set the TRACKING control to the center position.
9) Check that the FM waveform is flat.10) If the FM envelope is not flat, fine adjust the height of the supply and take-up guide rollers to flatten the FM envelope.
11) After adjustment is completed, tighten the guide roller fixing hexagonal screw.

Turn guide roller height adjustment screw a little at a time to flatten waveform.

Fig. 1-5

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1-5. A/C Head Adjustment (Figs. 1-6, 1-7)

Perform the height, tilt and azimuth adjustments repeatedly to determine the A/C head installation position, then adjust the X-value. Detailed adjustment below is the procedure when the A/C head is replaced; be sure to do precise adjustment after rough adjustment.

Note: For the X-value adjustment, refer to the service manual (electrical adjustment) issued for each model.

Rough Adjustment (Fig. 1-6) 1) Place the master plane on the cassette holder
Place the master plane on the cassette holder and lower the holder. Adjust NUT (A), AZIMUTH SCREW (B), TILT SCREW (C) and SCREW (D) so the height difference between the master plane and A/C head plate is approx. 1.78mm and A/C head base and A/C head plate are parallel.
Precise Adjustment (Figs. 1-6, 1-7)
Connect the oscilloscope to audio output (AV OUT).
4) Playback a lkHz audio signal on the alignment tape.
5) Adjust the AZIMUTH SCREW (B) and TILT SCREW (C) so the audio output is maximum and flat (without any fluctuations). (See Fig. 1-7)

Fig. 1-7

Fig. 1-6

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2. ADJUSTMENT AFTER REPLACING THE CYLINDER (VIDEO HEADS)

When the cylinder is replaced, the relative height with respect to the guide rollers or the X-value, etc. drifts (this drift is smallwhen the cylinder is replaced correctly). Therefore, it is necessary to readjust the tape transport system and servo system. Perform checks and adjustments by the following steps.

Note: For the X-value adjustment, refer to the service manual (electrical adjustment) issued for each model.
Load a blank tape and play it. Check that no curling or creasing occurs around the guide rollers. If curling or creasing occurs, fine adjust the height of the guide rollers.
Confirm that the FM envelope is flat and level fluctuations are minimum. If it cannot be confirmed, adjust the height of the guide rollers. See the next item for these checks.
3) Check or/and adjust the head switching point. (Refer to the service manual (electrical adjustment) issued for each model.)
4) Confirm that the X-value adjustment is correct. If it cannot be confirmed, adjust the X- value.

Check Flatness and Level Fluctuations of the FM Output

Connect an oscilloscope to test point of FM envelope.
2) Trigger the oscilloscope at SW30Hz.
3) Set the TRACKING control to center position.
4) Playback the alignment tape.
5) Adjust the voltage level control on the oscilloscope so the maximum amplitude of the FM output is 4 graduations on the oscilloscope. 6) Adjust the tracking control buttons so the
6) Adjust the tracking control buttons so the maximum amplitude of the FM output is 3 graduations on the oscilloscope. 7) Check that the minimum amplitude is more than
7) Check that the minimum amplitude is more than 2 graduations. If this cannot be confirmed, fine adjust the height of the guide rollers.

3. TENSION AND TORQUE CHECKS

It is necessary to check the tension, torque and compression strength in the tape take-up section and moving section to smoothen the tape transport and to satisfy the basic performance of the VCR. When the tape transport is not smooth or the tape speed is abnormal, detect the faulty section by this checking, and then check again after replacing the faulty parts with normal ones to complete the work.

Fig. 2-1

Fig. 3-1

3. TENSION AN

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ltem	VCR Operation	Measured Reel	Measurement Value	Remarks
Main brake	STOP	Supply	140 g·cm or more	Fig. 3-1
torque	5101	Take-up	100 g·cm or more	Fig. 3-1
Slack removal torque	UNLOADING	Supply	90∼200 g·cm	Fig. 3-1
Fast forward torque	F.FWD	Take-up	400 g·cm or more	Fig. 3-1
Rewind torque	REW	Supply	400 g·cm or more	Fig. 3-1
Take-up torque	PLAY	Take-up	80~110 g·cm	Fig. 3-1
Back-tension torque	F.FWD REW	Supply Take-up	4∼10 g·cm	Fig. 3-1

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CHAPTER 3 MAINTENANCE/INSPECTION PROCEDURE

1 Réquired Maintenance

The recording density of a VCR is much higher than that of an audio tape recorder. components must be very precise to ensure compatible with other VCRs. If any of these components are worn or dirty, the symptoms will be the same as if the part is defective. To ensure a good picture, periodic inspection and maintenance, including replacement of worn-out parts and lubrications, is necessary.

2. Scheduled Maintenance

Schedules for maintenance and inspection are not fixed because they are greatly according to the way in which the customer uses the VCR, and the environment in which the VCR is used. But, in general home use, a good picture will be maintained if the inspection and maintenance is done every 1.000 hours. Table 1 shows the relation between time used per day and inspection period.

lable 1

	When insp	ection is ne	ecessary
Average hours	About	About 18	About
used per day	l year	months	3 years
	↓	Ļ	Ļ
One hour
Two hours
Three hours

3. Check before starting Repairs

The faults occurring in the playback picture as shown in Table 2 can be remedied by cleaning and oiling. Check the need for lubrication and the conditions of cleanliness in the unit. Check with the customer to find out how often the unit is used. If from that you determine that the unit is ready for inspection and maintenance, check the parts shown in Table 2.


Та	b	L	е	2

Phenomenon	Inspection Location
Poor S/N, no	Dirt on video head
color	or it is degraded
Tape does not run or tape is slack	Dirt on pressure roller, cylinder or in tape transport system
Vertical jitter	Dirt on video head or in tape transport system
Low volume or	Dirt on video head or
sound distorted	it is degraded
Color beats	Dirt on full erase (FE) head or it is degraded

4. Tools Needed for Inspection and Maintenance

(1) Head cleaning kit
(2) VCR oil and grease (Table 3)
(3) Alcohol
(4) Gauze(5) Cleaning tape (Dry type)

Table 3 locations for Greasing and Diling

Name	Oil or Greasing Location
Sonic Slidas Oil (#1600)	Oil low-speed rotating sections
Froil (G31-SAY)	Lubricate metal or molded section under light load
Molicoat (PG-641)	Lubricate metal or molded sections under light load
Lock paint	Fix adjustment screws and nuts.

5. Maintenance Procedures

5-1 Cleaning

(1) Cleaning video head

First use a cleaning tape. Read its instruction sheet carefully before using it. If dirt on head is too stubborn to remove by tape. use the cleaning kit. Moisten the cleaning stick with cleaning fluid at the point indicated. Touch the stick to the head tip and gently turn the head (rotating cylinder) to the right and left. (Do not move the stick vertically and make sure that only the chamois leather on the stick comes into contact with the head Otherwise, the head may be damaged.) Thoroughly dry the head. Then test run a tape. If cleaning fluid remains on the video head, the tape may be damaged when in comes into contact with the head surface

cleaning fluid

leather to the head tip and gently turn the head

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(2) Cleaning the tape transport system and drive system, etc.
- Wipe with gauze moistened with alchol.
- Notes: 1) The tape transport system is the system which comes into contact with the running tape. The drive system consists of those parts which run the tape.
  - Make sure that during cleaning you do not touch the tape transport system with the tip of a screwdriver and that no force is applied to the system that could deform it.

5-2 Lubrication

(1) Guide lines for lubricating with oil

Use the oiler to apply one or two drop of Sonic Slidas oil. Make sure not to use too mach oil because it may spill over or leak out coming into contact with rotating parts and causing slippage or other problems. If too much oil is applied, wipe clean with alchohol.

(2) Periodic oil lubrication

Lubricate the specified locations only when replacing components. Refer to the exploded views for the lubricating locations.

5-3 Greasing

(1) Greasing guidelines

Apply grease Froil or Molicoat, with a stick or brush. D0 not use excess grease. It may come into contact with the tape transport or drive system. Wipe any excess and clean with gauze moistend with alcohol.

(2) Periodic greasing

Grease the specified locations only when replacing components. Refer to the exploded views for the greasing locations.

Table 4 Parts to be Maintained/Inspected and Maintenance/Inspection Schedules

Caution: The following table does not apply to all units. The maintenance/inspection schedules depend on how the unit is used and the environment in which it is used.

Hours	1000	2000	2000	4000	E000	0000
Component	1000	2000	3000	4000	5000	6000
Video heads (upper cylinder)	C / R	C/R	C / R	C / R	C∕R	C / R
Audio/control head	С	C/R	С	R	С	C/R
Full erase head	С	С	С	R	С	С
Supply guide roller	С	С	С	С	С	С
Supply guide pole/post	С	С	С	С	С	С
Take-up guide roller	Ç	С	С	С	С	С
Take-up guide pole/post	С	С	С	С	С	С
Tension band		R		R		R
Supply reel disk	С	С	С	С	С	С
Take-up reel disk	С	С	С	С	С	С
Impedance roller	С	С	С	С	С	С
Pressure roller	С	R	С	R	С	R
Reel drive belt	С	R	С	R	С	R
Capstan shaft	C		C		0
(capstan motor)		U/K	C	C/R	С	C/R
Loading motor		R		R		R
Cylinder motor (lower cylinder)		R		R		R

C : Cleaning

R : Parts replacing

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E4 Ν

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HITACHI

HITACHI LTD. TOKYO JAPAN International Sales Division, THE HITACHI ATAGO BLDG. No. 15 -12 Nishi-Shinbashi, 2 - Chome, Minato-Ku, Tokyo 105, Japan Tel. Tokyo 3 32581111

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HITACHI VIEWCAM chassis (mechanizm) Service manual & schematics

SERVICE MANUAL

PCF-9 MECHANISM

VHS

VIDEO CAMERA/RECORDER

CONTENTS

CHAPTER 1 DISASSEMBLY

CHAPTER 2 MECHANICAL ADJUSTMENT

CHAPTER 3 MAINTENANCE/INSPECTION PROCEDURE

CHAPTER 4 EXPLODED VIEWS

DISASSEMBLY

1. REMOVAL PROCEDURE

2. MAIN MECHANICAL COMPONENTS IDENTIFICATION

2-1. Top View

2-2. Bottom View

3. MAIN MECHANICAL COMPONENTS REMOVAL

3-4. Full Erase (FE) Head

*3-8. Pressure Roller Assembly

Cautions :

*3-11. Take-up Reel Disk

3-14. Take-up Guide Roller

*3-18. Supply Sub Brake

Caution when reinstalling

*3-22. Pressure Roller Control Arm

*3-23. Cassette Holder Lock Slider

•Caution when reinstalling

*3-25. Loading Gear

*3-29. Cam Gear Arm

*3-30. Cassette Holder Lock Drive Arm

CHAPTER 2

MECHANICAL ADJUSTMENT

JIGS AND TAPES FOR ADJUSTMENT

1. TAPE TRANSPORT SYSTEM COMPONENTS CHECK/ ADJUSTMENT

1-1. Reel Disk Height Adjustment (Fig. 1-1)

Tension Pole Position Adjustment

Tension Adjustment

1-3. Take-up Guide Poles Height Adjustment (Fig. 1-3)

1-5. A/C Head Adjustment (Figs. 1-6, 1-7)

2. ADJUSTMENT AFTER REPLACING THE CYLINDER (VIDEO HEADS)

Check Flatness and Level Fluctuations of the FM Output

3. TENSION AND TORQUE CHECKS

3. TENSION AN

CHAPTER 3

MAINTENANCE/INSPECTION PROCEDURE

1 Réquired Maintenance

2. Scheduled Maintenance

3. Check before starting Repairs

4. Tools Needed for Inspection and Maintenance

Table 3 locations for Greasing and Diling

5. Maintenance Procedures

5-1 Cleaning

(1) Cleaning video head

5-2 Lubrication

(1) Guide lines for lubricating with oil

(2) Periodic oil lubrication

5-3 Greasing

(1) Greasing guidelines

(2) Periodic greasing

Table 4 Parts to be Maintained/Inspected and Maintenance/Inspection Schedules

HITACHI